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net: Add netif_get_gro_max_size helper for GRO

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Add a small netif_get_gro_max_size() helper which returns the maximum IPv4
or IPv6 GRO size of the netdevice.

We later add a netif_get_gso_max_size() equivalent as well for GSO, so that
these helpers can be used consistently instead of open-coded checks.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240923212242.15669-1-daniel@iogearbox.net
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Daniel Borkmann 2024-09-23 23:22:41 +02:00 committed by Paolo Abeni
parent 6c24a03a61
commit e8d4d34df7
2 changed files with 11 additions and 7 deletions
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9
include/linux/netdevice.h
View File

@ -5029,6 +5029,15 @@ void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs);
void netif_inherit_tso_max(struct net_device *to,
const struct net_device *from);
static inline unsigned int
netif_get_gro_max_size(const struct net_device *dev, const struct sk_buff *skb)
{
/* pairs with WRITE_ONCE() in netif_set_gro(_ipv4)_max_size() */
return skb->protocol == htons(ETH_P_IPV6) ?
READ_ONCE(dev->gro_max_size) :
READ_ONCE(dev->gro_ipv4_max_size);
}
static inline bool netif_is_macsec(const struct net_device *dev)
{
return dev->priv_flags & IFF_MACSEC;

9
net/core/gro.c
View File

@ -98,7 +98,6 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb)
unsigned int headlen = skb_headlen(skb);
unsigned int len = skb_gro_len(skb);
unsigned int delta_truesize;
unsigned int gro_max_size;
unsigned int new_truesize;
struct sk_buff *lp;
int segs;
@ -112,12 +111,8 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb)
if (p->pp_recycle != skb->pp_recycle)
return -ETOOMANYREFS;
/* pairs with WRITE_ONCE() in netif_set_gro(_ipv4)_max_size() */
gro_max_size = p->protocol == htons(ETH_P_IPV6) ?
READ_ONCE(p->dev->gro_max_size) :
READ_ONCE(p->dev->gro_ipv4_max_size);
if (unlikely(p->len + len >= gro_max_size || NAPI_GRO_CB(skb)->flush))
if (unlikely(p->len + len >= netif_get_gro_max_size(p->dev, p) ||
NAPI_GRO_CB(skb)->flush))
return -E2BIG;
if (unlikely(p->len + len >= GRO_LEGACY_MAX_SIZE)) {